Sliding spindle for grinding-disks.



J. MILLER, JR- SLIDING SPINDLE FOR GRINDING DISKS. APPLICATION FILEDIULY1 6,1907.

Patented Feb. 9, 1909.

UNITED STATESPATENT ()FFICE.

JOHN MILLER, .13., or BELOIT, WISCONSIN, ASSIGNOR To CHARLES H. BESLY,or cmoaco,

- f ILLINOIS. 2

SLIDDING srmnnn FOR ciamnmc-msxs.

Patented Feb.,9, 1909.

Application filed July 16, 1907. Serial No. 388,956.

To all "whom it may concern:

Be it known that I, JOHN MILLER, Jr., a

' citizen of the United States, and a resident of Beljoit, in the countyof Rock and State of Wisconsin, have invented certain new and usefulImprovements in Sliding Spindles for Grinding-Disks; and I do herebydeclare that the following is a full, clear, and

' exact description thereof, reference being the letters of referencemarked thereon,

hadto the accompanying drawings, and to which form a part of thisspecification.

This invention relates to improvements in grinding or polishingmachines, and more particularly to flat surface grinding machines, orwhat are generally known as disk grinders.

The vention relates more especially to means in a grinding machine bywhich a grinding disk may be moved bodily toward and from the, Work inthe direction of the axis'of rotation of the disk.

The invention consists in the matter hereinafter set. forth and moreparticularly pointed out in the appended claims.

My invention may be better understood by reference to the accompanyingdrawings,

in which,-

. Figured is a view in side elevation showing my improvement embodied-ina grinding machine.v Fig. 2 is a horizontal, axial section taken in theplane of the disk-supporting spindle of the machine. Fig. 3 is avertical section, rta'kenon the line 33 of lllig. 2.

Fig. 4 is a vertical section, taken on line H of Fig. 2.

As shown in the drawings, A indicates the hereshcwn as comprising .avertically and horizontally adjustable work-table A for supporting apiece of work .between-thejsaid disks insuch manner that two oppositefaces" thereof may beground at the same time.

.(ilne of said head stocks E8 is horizontally .inovable in a directionparallel to the axis of its spindle in order 'to vary the distance between the faces of said grindin disks to accommodate pieces :of wgrk toe ground of sizes. The general construction and arrangement of saidmovable head-stock is simi'lar to that of the ordinary tail-stock of alathe, it being arranged to slide longitudinally along the bed-plate ofthe grinding machine. Each of said head stocks comprises two uprightmembers I) b, the up- I per ends of, hich are formed to provide journal'boxe for the said disk-carrying spindle. The said journal boxes arehori zontally divided, the upper parts or bearing caps 6 being securedto the lower parts by stud-bolts 6 Between the two journal boxes of eachhead-stock are mounted driving pulleys c c which are fixed to the twodisk spindles or shafts The. movable head-stock B is provided with alongitudinally sliding spindle "C which is designed to be moved endwisein 'its bearings in order to carry the grinding disk :0 towards the workor to withdraw it from the same. The means for giving sliding movementof the spindle C2111 its bearings comprises features of gonstruction asfollows: 0 0 indicate two bushings or sleeves surrounding the endportions of the spindle G andare immovable endwise on the spindle sothat the latter moves endwise with the sleeves, and the latter arenon-rotative; the spindle being adapted to'turn freely therein. In the.construction illustrated, the said sleeve cHis lon itudinally splitordivided by a horizontal p ane into semi-cylindric upper and lowerportions which areseparated a edges to form a "longitudinal slot inwhich is arranged a spline c, said spline extending radially outwardlyand being clamped between the upper and lower parts of the j.our-. nalbox, whereby said sleeve is prevented from rotating. The sleeve 0 ismade of one "piece of metaland is not split, and said sleeve is providedon its forward side with a longitudinally extending groove in which isarrangeda spline 0 sai'd'spline extending radially-outwardly and beingsecured in the same manner as the spline a, whereby the sleeve 0 isprevented from rotating. 0* 1ndica'tes a grease cup by means of whichthe spindle O is lubricated. On its outer end, or and remote from thegrinding disk C the I Said sle'evesare arranged to slide longitudinallyin the said journal boxes small distance along-their forward meeting 7sleeve-c is enlarged in diameter and said enlarged ort'ion is'.'provided on one side with an ntegral longitudinally extending rib onwhich are formed rack-teeth a which mesh with a gear wheel arranged toturn on an axis transverse to the spindle C and by means of whichlongitudinal movement is givento the said sleeve. Said sleeve 0 is heldfrom endwise movement on the spindle C by means of thrust collars a and0 which surround the spindle in contact with the inner and outer ends ofsaid sleeve. The thrust collar 0 is interposed between the inner endface of the sleeve 0 and the hub of the pulley c and the thrust collar 0is interposed between the outer end face of the said sleeve and a collar0 which is secured by a set-screw to the end of the spindle C Saidcollar 0 can be adjusted longitudinally mounted a micrometer screw Ecome into contact with a on the spindle in order to compensate for wearof the parts. The pinion D is secured on a shaft D which is j ournaledin. a stationary bearing member D formed integral with the head-stock BSaid shaft is shown as arranged vertically and as provided at its upperend with a crank-arm or hand-lever D by means of which the shaft andpinion may be rotated for the purpose of giving movement to the saidspindle G On the sleeve c is a depending lug e in which is arranged tostationary part of the head-stock B Said screw'constitutes an adjustablestop for accurately stop ing the forward movement of the spindle 2 atany predetermined point whereby any desired amount of material may beground oif from a piece of work placed between the two disks C and C Forthis purpose said micrometer screw is conveniently provided with ascale-plate e fixed to said lug e.

In the operation of a grinding machine equipped with a slidingdisk-carrying spin dle, such as has been above described, it is intendedthat the movable head-stock B shall be placed in a position permittingthe two disks to be separated a desired distance. The object to beground is placed and al-' lowed torest upon the table A and the twodisks are then moved towards each other by sliding the spindle C inwarduntil the.de-

slred amount of material has been ground oil", the object being ground,which rests loosely on the table, adjusting itself laterally as themovable disk is advanced so that the material is removed to an equalextent from Therack and pinion actuating connection between the slidingspindle and the stationary bearing member has the advantage of givingmotion to the spindle at uniform speed relatively to the turningmovement of thehand-lever, in allpositions of the latter whlle, at thesame time, it is of simple construction and is durable because itswearing parts are'not liable to receive between them dust or gritarising from the grinding operat1on.-

The features constituting my invention are more particularlv applicableto the form of machine illustrated which includes two grinding disks,turning about a common axis of rotation, and one which is movable towardand from the other in the direction of said axis, so that said disks areadapted to operate at the same time on opposite faces of an object whichis held between the disks, and which is free to adjust itself laterallyso that both disks will act equally, or with equal pressure, thereon. Amachine embracing this feature has reat advantages for use in finishingtwo flat faces on opposite sides of an object.

Manifestly, the features of construction illustrated and described inthe means for mounting the grinding'disk shaft in the machine frame, andfor giving endwise movement to said shaft, may be used in connectioneither with a single disk grinder or with a double disk grinder, such asis shown in the accompanying drawings.

I claim as my invention l. A grinding machine comprising a machineframe, a non-rotative endwise movable sleeve provided with alongitudinal groove, a bearing on the frame for said sleeve providedwith a spline which enga es the groove in said sleeve to hold the latterfrom rota- 9 tion, a grinding-disk spindle which turns in and hasendwise movement with said sleeve, said sleeve projecting at one endoutside of said bearing, and means for giving endwise movement to thesleeve embracing longitudinally arranged rack teeth on the part of saidsleeve which projects outside of the bearing, and a gear wheel mountedon the machine frame to turn on an axis at right angles to that of thedisk spindle and engaging said rack teeth on the said sleeve.

2. A grinding machine comprising a machine frame, a non-rotative endwisemovable sleeve provided with a longitudinal groove,

a bearing box for said sleeve consisting of 11 two longitudinallyseparated parts, and a spline which is clamped between the parts of saidbearing box and enters said groove to hold the sleeve from rotation.

3. A grinding machine comprising a machine frame, a non-rotative,endwise movable sleeve provided with a longitudinal groove,

a two-part bearing box for said sleeve, a spline clamped between themeeting edges of the bearing box and extending inwardly into said groovein the sleeve, and a grinding disk spindle which turns in said sleeveand has endwise movement with the same, said spindle being-provided withbearing shoulders for contact with the ends of said sleeve to hold thespindle from endwise movement in the sleeve.

4. A grinding machine comprising a machine frame, a non-rotative,endwise movable sleeve provided with ,a longitudinal groove, 1 0

a bearing box for said sleeve consisting of two longitudinally separatedparts, a spline which is clamped between the parts of said bearing boxand enters said groove in said thereon, anda gear wheelinounted on themachine frame and engaging said gear teeth.

5. A grinding machine comprising a machine frame, a non-rotative endwisemovable sleeve provided with a longitudinal groove, a two-part bearingbox for said sleeve, a spline clamped between the parts of the hearingbox and extending inwardly into said groove, a grinding-disk spindlewhich turns in said sleeve and has endwise movement with the same, saidspindle being provided with bearing shoulders for contact with the endsof said sleeve to hold the spindle from endwise movement in the sleeve,said sleeve extending at one end outside of said journal box, and beingprovided on its extended end with gear teeth, and a gear wheel mountedon the machine frame and engaging said gear teeth.

6. A grinding machine comprising a machine frame provided with ahead-stock having. two journal boxes in alinement with each other,non-rotative sleeves moifnted to slide endwise in said journal boxes andhaving splined connection with the same, a grinding disk spindleextending through and turning in both of said sleeves and a drivingpulley aflixed to said spindle between said sleeves, said spindle beingprovided with shoulders engaging the ends of both of said sleeves tohold the said spindle from endwise movement relatively to the sleeves.

In testimony, that I claim the foregoing as my invention I afiix mysignature in the presence of two witnesses, this 2nd day of July, A. D.1907.

JOHN MILLER, J R. Witnesses:

A. F. SPAULDING, EDWARD P. 'VVELLEs.

